Interesting to see /programmes being customised for the One Show, so that episodes of the programme have The One Show site header (and navigation)...
http://www.bbc.co.uk/programmes/b00dw824
For "on-demand", you'll have spotted that we're using Flash, within the lovely embedded media player that you're familiar with for TV in the iPlayer. Under the hood is a protected MP3 stream for now: again, we're shifting over to AAC-family later in the year. The real difference here is the quality - we've significantly improved the bitrates we can offer.
For on-demand content, we're launching iPlayer with four MP3 profiles based on the content of the programme: and we're using four different bitrates for these profiles.
* Pop music (eg Radio 1 or Asian Network) is 128k stereo.